Snowplow shoe



y 8, 1940. H. L. CAMPBELL 2,202,309 sfiowPLow SHOE Filed Dec. 31, 1958 2Sheets-Sheet 2 5 9 59 I g 6 i 0 6 6/ 6/ INVENTOR, H4PPY L. CRMPBELL ATTORNEY Patented May 28, 1940 r STATES PATENT OFFlCE" SNOWPLOW SHOEHarry L. Campbell, St. Paul, Minn, assignor to American Hoist andDerrick Company, St. Paul, Minn, a corporation of Delaware ApplicationDecember 31, 1938, Serial No. 248,813 7 Claims. (01. 280-28) Thisinvention relates to a shoe or runner of character adapted to support anentity or vehicle, such, for example, as a snowplow, for sliding ordragging movement over the ground or other surface.

An object of the invention is to provide a shoe or runner adapted to thepurpose of supporting an entity or vehicle for sliding or draggingmovement which will be of novel and improved con- 10 struction.

A further object is to provide a shoe or runner for supporting an entityor vehicle for sliding or dragging movement wherein will be incorporatedvarious improved features and characteristics of 15 construction.

A further object is to provide a novel and improved shoe or runner forsupporting an entity 01' vehicle for sliding or dragging movement whichwill be of structure to be or remain efficient and satisfactory in usefor a long period of time though subjected to severe blows, shocks,strains and abrasive action.

A further object is to provide a novel and im; proved shoe or runner ofthe present character which will incorporate features andcharacteristics of construction intended to render the shoe or runnercapable of withstanding, and remaining intact against, blows, shocks andstrains which said shoe or runner inevitably must encounter in use, andwill also incorporate other and different features and characteristicsof construction intended to render the shoe or runner capable of moreefiectively resisting wear or abrasive action than have more or lesssimilar shoes or runners heretofore of commerce.

A further object is to provide a novel and improved shoe or runner forsupporting an entity or vehicle, such as a snowplow, for sliding ordragging movement over the ground or other,

40 surface which will include a supporting body or casing member ofmetal possessing physical properties, including toughness, adapted torender said supporting body or casing member yieldable to force withoutbreaking, and will also include 5 one or more insert pieces of metalpossessing physical properties, including hardness, adapted to rendersaid insert piece, or insert pieces, quite efiectively resistant to wearor abrasive action, and in which said shoe or runner said supportingbody or casing member and said insert piece, or insert pieces, will beassembled together so that the supporting body or casing member housesand confines and protects the insert piece, or insert pieces, againstblows, shocks and strains, 55. and said insert piece, or insert pieces,will be adapted to engage the ground or other surface and resist wear orabrasive action upon the shoe or runner occasioned by sliding ordragging movement of said shoe or runner.

Iron and steel are most useful to the purpose of providing shoes orrunners of the character herein presented. It is well known that ironand steel products when treated and made hard, and

thus more capable of resisting abrasive action, have tendency towardbecoming brittle, and thus less suitable to absorb blows, shocks andstrains without breaking. On the contrary, iron and steel products whentreated and made tough,

and thus more capable of absorbing blows, shocks and strains, havetendency toward becoming soft, andv thus less capable of resistingabrasive action. Heretofore, iron and steel products at once in eludingtough cores yieldable to force without breaking and hard, wear-resistingsurfaces have been produced by suitable treatment of the bodies of theproducts designed to make them tough and skin hardening or casehardening of said products.

It is an object of the present invention to provide a novel and improvedshoe or runner adapted to support an entity or vehicle for sliding ordragging movement which will at once include a tough core constituted asa supporting body or casing member of the shoe or runner and a hard,wear-resisting surface constituted as an insert piece, or insert pieces,incorporated in, said supporting body or casing member.

A further object is to provide a shoe or runner adapted to support anentity or vehicle for sliding or dragging movement over the ground orother surface which will include a supporting body or casing memberofmetal, iron or steel, and'an insert piece, or insert pieces, of metal,iron or steel incorporated in said supporting body or casing member,wherein said insert piece, or insert pieces, will possess hardness orwear-resisting quality as an essential characteristic thereof and willbe adapted to ride upon the ground or other surface, said supportingbody or casing member will constitute, in efiect,'a core of said shoe orrunner possessing toughness, or ability to yield to force withoutbreaking, as an essential characteristic thereof and will be assembledwith said insert piece, or insert pieces, to cause the insert piece, orinsert pieces, to be protected in the structure against the possibilityof becoming broken or otherwise impaired, and said insert piece, orinsert pieces, will have relation to said supporting body or casingmember adapted to cause wear upon the supporting body or casing memberto be less rapid than otherwise would be the case were said insertpiece, or insert pieces, not present in the structure.

And a further object is to provide a shoe or runner of the presentcharacter which will include a supporting body or casing member and aninsert piece, or insert pieces, assembled together in novel and improvedmanner.

With the above objects in view, as well as others which will appear asthe specification proceeds, the invention comprises the construction,arrangement and combination of parts as now to be fully described and ashereinafter to be specifically claimed, it being understood that thedisclosure herein is merely illustrative and intended in no way in alimiting sense, changes in details of construction and arrangement ofparts being permissible so long as within the spirit of the inventionand the scope of the claims which follow.

In the accompanying drawings forming a part of this specification,

Fig. 1 is a side elevational view of a snowplow shoe or runner includingfeatures and characteristics of the invention;

Fig. 2 is a top plan view of the snowplow shoe of Fig. 1;

Fig. 3 is a bottom plan view of the snowplow shoe of Figs. 1 and 2;

Fig. 4 is a top plan view of the body or casing member of the snowplowshoe of Figs. 1 to 3, without the insert pieces and the attachmentelements adapted to be assembled and united with said body or casingmember to produce said snowplow shoe;

Fig. 5 is a side elevational view of one type of insert piece adapted tobe assembled and united with the body or casing member of Fig. 4, asdisclosed between insert pieces of the character as shown in Fig. '7;

Fig. 6 is an end elevational view of the insert piece of Fig. 5;

Fig. 7 is a side elevational view of another type of insert pieceadapted to be assembled with and secured to the body or casing member ofFig. l, as disclosed at the opposite sides of an insert piece of thecharacter as shown in Fig. 5;

Fig. 8 is an end elevational view of the insert piece of Fig. '7;

Fig. 9 is an end elevational. view of the snowplow shoe of Figs. 1 to 3;

Fig. 10 is a transverse sectional view, taken on line Iii-ll] in Fig.2;

Fig. 11 is a transverse sectional view, taken on line in Fig. 4;

Fig. 12 is a side elevational View of a snowplow shoe of modifiedconstruction including features and characteristics of the invention;

Fig. 13 is a top plan View of the snowplow shoe of Fig. 12;

Fig; 14 is a top plan view of the insert piece of the snowplow shoe ofFigs. 12 and 13, as said insert piece would appear disassembled from thebody or casing member of said snowplow shoe of said Figs. 12 and 13;

Fig. 15 is an end elevational view of the snowplow shoe of Figs. 12 and13;

Fig. 16 is a transverse sectional view, taken on line iii-46 in Fig. 13;

Fig. 1'7 is a fragmentary longitudinal sectional view, taken on line inFig. 14;

Fig. 18 is a transverse sectional view, taken on line |8|8 in Fig, 14;and

Fig. 19 is a fragmentary longitudinal sectional view, taken on line|9--|9 in Fig. 13.

With respect to Figs. 1 to 11 of the drawings and the numerals ofreference thereon, a supporting body or casing member of the snowplowshoe there shown is denoted 2B and insert pieces of said snowplow shoeare, respectively, indicated 2| and 22.

As disclosed, the body or casing member 2|] is constituted as agenerally rectilinear block or plate of metal having a fiat uppersurface 23, a fiat lower surface 24- in spaced, parallel relation to theupper surface 23, generally curvilinear opposite side surfaces 25 whichextend upwardly and outwardly from the flat lower surface 26 to theupper surface 23, and generally curvilinear opposite end surfaces 26which also extend upwardly and outwardly from said flat lower surface 24to said upper surface 23.

The body or casing member 20 is adapted to be secured in supportingrelation to an entity or vehicle, such as a snowplow, so that the fiatlower surface 24 of said body or casing member 28 can rest squarely uponthe ground or other surface over which it is intended to slide or dragsaid entity, vehicle or snowplow.

The flat lower surface M of the body or casing member 2|] is providedwith a rectilinear concavity 2'l, which as shown is disposed centrallyof said fiat lower surface. Desirably, the concavity 21 has considerablelength, width and depth. As disclosed, said concavity 21 is defined atits base by a flat surface 28 which is separated from the upper surface23 of the body or casing member 20 by a thin wall 29, at its oppositeends by spaced apart surfaces 30 each of which is adjacent an endportion of said body or casing member, is substantially perpendicular tothe fiat upper and lower surfaces 23 and 24 and extends transversely ofthe body or casing member, and at its opposite sides by spaced apartsurfaces 3| each of which is adjacent a side portion of said body orcasing member 20, is substantially oblique to the flat upper and lowersurfaces 23 and 24 and extends longitudinally of the body or casingmember. The spaced apart surfaces 3| which define the side walls of theconcavity 21 slant downwardly and inwardly of the block or plate ofmetal which constitutes the body or casing mem ber 26, toward eachother.

Each insert piece 2|, 22, 2| is constituted as an oblong mass of metalwhich is angular in cross section, and all of said insert pieces areadapted to be disposed or situated within the concavity 21, desirably toexactly fill said concavity and so that the lower surfaces 32 of theinsert pieces are exactly flush with the fiat lower surface 24 of thebody or casing member 20. In the disclosure as made, the insert piece 22is between the insert pieces 2|, 2i and is secured within the concavity2'! and to the wall 29 of said body or casing member 26 in relation tosaid insert pieces 2| to cause these latter to be fixedly and rigidlyretained within said concavity. More explicitly, each insert piece 2!has length equal to that of the concavity 21, a flat upper surface 33adapted to engage the flat surface 28, an outer side surface 34 whichslants downwardly and inwardly of the block or plate of metalconstituting the body or casing member 20 and is adapted to engage anadjacent surface 3| defining a side wall of said concavity 21, and aninner surface 35 which slants downwardly and outwardly of said block orplate of metal. The adjacent side surfaces 35, 35 of the differentinsert pieces 2|, 2|, respectively, are spaced apart a distance, when inplace, adapted to define a space between said adjacent surfaces of sizeto snugly receive the insert;

piece 22. Said insert piece 22 has length equal to that of the concavity21, a flat upper surface 36 adapted to engage the fiat surface 28, andouter side surfaces 31, 31 which slant downwardly and outwardly and are,respectively, adapted to engage the adjacent side surfaces 35, 35 of theinsert pieces 2| 2| respectively. The arrangement is such that securingof the insert piece 22 within the concavity 21 between the insert pieces2 2| causes said insert pieces 2 I 2! to be fixedly and rigidly retainedwithin said concavity. Clearly, the insert pieces 2|, 2| will be lockedor fastened within the concavity 21, when the insert piece 22 is madesecure within said concavity, by reason of the engagement of adownwardly and inwardlyslanting side surface 3| of the block or plate ofmetal 26 with an outer downwardly and inwardly slanting side surface 34of each of said insert pieces 2| and the engagement of a downwardly andoutwardly slanting side surface 3'! of said insertpiece 22 with an innerdownwardly and outwardly slanting side surface 35 of each of said insertpieces 2|. That is, the slanting or oblique side surfaces 3|, 3| of theconcavity 2'! and the slanting or oblique side surfaces 31, 37 of theinsert piece 22 together provide or supply means through theinstrumentality of which the insert pieces 2|, 2| are fixedly andrigidly secured,

in dovetail fashion, so to speak, within the concavity 21.

As shown, the wall 29 between the fiat upper surface 23 and the base 28of the concavity 21 includes spaced apart apertures or openings38 whichare adapted to receive attachment lugs or bosses 39 upon the fiat uppersurface 36 of the insert piece 22. In the disclosure as made, saidinsert piece 22 is fixedly and rigidly united with the wall 29 bywelding the lugs or bosses 39 within theapertures or openings 38 and tothe metal of said wall 29. In the manufacture of the shoe or runner, theinsert pieces 2| 2| will be first situated within the concavity 21, andthe insert piece 22 will afterwards be situated within said concavityand united with the block or plate 2|] by welding of the lugs or bosses39 to the wall 29 while said insert piece 22 is in retaining and lookingor fastening relation to the insert pieces 2|. When the welds whichunite the block or plate and the insert piece 22 with each other arecomplete, the upper surface 23 of the block 'or plate may desirably be,or be made, smooth and even, as disclosed at the central portion of Fig.2.

Attachment elements 40, for securing the shoe to an entity, vehicle orsnowplow which is to be slid or dragged over the ground or other surfacewhile supported by a'plurality of shoes of the character here presented,may be of any construction .which ina particular instance may besuitable. As disclosed, the shoe includes three attachment elements 4!)welded in spaced apart relation to each other to the flat upper surface23 of the body or casing member 20. That is, there are two spaced apartattachment elements ill adjacent one end of the shoe and a singleattachment element 49 adjacent the opposite end of said shoe. Eachattachment element is constituted as an apertured ear to be secured tothe entity, vehicle or snowplow which is to be supported.

adapted or intended torender the shoe or runner I capable of moreeifectively resisting wear orabra sive action than have more or lesssim'iliar shoes or runners heretofore known. The insert piece 22 can becomposed of metal of the nature of that of the body or casing member 20,or of the nature of that of the insert pieces 2|, 2| or of some othernature. I A material or metal which satisfactorily'and efliciently canconstitute the body or casing member 20 is low carbon cast steel, whichpossesses physical properties,including toughness, adapted to rendersaid body or casing member yieldable to force without breaking. Amaterial or metal which satisfactorily and efficiently can constitutethe insert pieces 2|, 2| is Nihard cast iron, which possesses physicalproperties, including hardness, adapted to render said'insert pieces 2|,2| quite eifectively resistant to wear or abrasive action. As beforementioned, the insert piece 22 can be of any suitable nature. When saidinsert'piece 22 is of nature to materially resist wear or abrasiveaction, it of course will operate in assistance with the insert pieces2|, 2| to slow down inevitable Wearing away of the shoe or runner.

The body or casing member 20 and the insert pieces 2|, 22, 2| areobviously assembled together in such manner that the supporting body orcasing member houses and confines and protects said insert piecesagainst blows, shocks and strains, and so that the insert pieces canengage the ground or other surface over which the shoe or runner is tobe slid or dragged and resist wear or abrasive action upon said shoe orrunner. The shoe or runner of Figs. 1 to 11 at once includes what is ineffect a tough core constituted as the body or casing member 20 and ahard, wear-resisting surface constituted as, or provided by, the insertpieces 2|, 2|, as well as the insert piece 22 when this is composed ofvhardmetal intended to assist in opposing wear or abrasive action.

While cast steel having low carbon content has been mentioned as amaterial or metal of which the body 01' casing member 20 can becomposed, and Nihard cast iron has been mentioned as a material or metalof which the insert pieces 2 l, 2 I, can be composed, it is to beunderstood that other metals of nature to accomplish the same orsubstantially similar results can be substituted for the metalsspecifically mentioned. In any event, the body or casing member 20, orequivalent, will be of metal selected to possess toughness or ability toyield to force without breaking, as an essential characteristic of saidbody or casing member, and the insert pieces 2|, 2|, or equivalent, willbe of metal selected to possess hardness of Wearresisting quality as anessential characteristic of said insert pieces. In any installation, theinsert pieces, such as 2|, in number as shown,

or greater or less number, will be adapted to engage the groundor othersurface over which the shoe or runner is to be slid or dragged, the bodyor casing member, such as 20, will be assembled with the hard,wear-resisting insert pieces to cause said insert pieces to be protectedin the structure against the liability of becoming broken or otherwiseimpaired, and the hard, wear-resisting insert pieces will have relationto the body or casing member, or core, which supports said insertpieces, adapted to cause wear upon the shoe or runner to be considerablyless rapid than would be the case were the hard, wear-resisting insertpieces not incorporated in the structure.

' With respect. to Figs. 12 to 19, a supporting body or casing memberthere shown is denoted 45 and a single insert piece of the shoe orrunner is indicated 45.

The body or casing member 45 is constituted as a generally rectilinearblock or plate of metal having a flat upper surface 41, a flat lowersurface 48 in spaced paralled relation to the upper surface 41,generally curvilinear opposite side surfaces 49 which extend upwardlyand out wardly from the fiat lower surface 48 to the upper surface 41,and generally curvilinear opposite end surfaces 50 which also extendupwardly and outwardly from said flat lower surface 48 to said uppersurface 47.

The body or casing member 45 is adapted to be secured in supportingrelation to an entity or vehicle or snowplow so that the flat lowersurface 48 of said body or casing member 45 can rest squarely upon theground or other surface over which it is intended to slide or drag saidentity, vehicle or snowplow.

The flat lower surface 48 of the body or casing member 45 is providedwith spaced apart, longitudinally extending concavities which as shownare disposed substantially centrally of said flat lower surface. Theconcavities 5! are in fact provided by spaced apart flanges 52 which areintegral with and extend downwardly from an internal surface 53 of thebody or casing member defining the base of each of said concavities 5i.The surface 53 is provided by a comparatively thin wall 54 which isdisposed between'said surface 53 and the upper surface 4'? of the bodyor casing member 45. More explicitly, there are two flanges 52 and threeconcavities 5! as dis-. closed, including two outer concavities 5!, oneadjacent each side of the shoe or runner and a middle concavity 5ibetween said outer concavities and also between the flanges 52. Eachouter concavity 5| is defined at its base by the surface 53, at itsouter side by a downwardly and inwardly slanting side surface 55 of theblock or plate of metal 45, at its inner side by a downwardly andoutwardly slanting side surface 55 of the adjacent flange 5.2, and atits opposite ends by metal of the block or plate 45. Each middleconcavity 5! is defined at its base by said surface 53, at each of itsopposite sides by the adjacent v downwardly and inwardly slanting sidesurface 5'] of the flange 52 at the corresponding side of said middleconcavity, and at its opposite ends by metal of said block or plate.

The block or plate of metal which constitutes the body or casing member45 includes additional concavities 58 adjacent the ends of and above theconcavities 5i, and all of said concavities 53 are in open relation tothe concavlties 58.

The insert piece 48 is constituted as a rectilinear piece of metaincluding a frame '59 thereof adapted to lie contiguous with the surface53 and having portions at its opposite ends adapted to lie in theconcavities 58. Said insert piece .46 also includes oblong masses 64 ofmetal which are integral with the frame 59 and extend downwardlytherefrom into each of the concavitics 5!, desirably to exactly fillsaid concavities 5i and so that the lower surfaces 6! of said oblongmasses 55 are flush with the lower surfaces 52 of the flanges 52, whichsurfaces 52 desirably terminate flush with the fiat lower surface 48 ofthe body or casing member 45. The arrangement is such that the insertpiece 46 is fixedly and rigidly incorporated or inlaid into theconcavities 5| and 58 of the body or casing member 45 and so that saidinsert piece 46 desirably completely fills all of said concavities.

In practical manufacture of the shoe or runner as disclosed in Figs. 12to 19, the body or casing member 45 and the insert piece 46 can beunited by casting the one within the other.

Attachment elements 63, for the same purpose as are the attachmentelements 48, may also be of any desired construction. As disclosed, theshoe of Figs. 12 to 19 includes two attachment elements 63 arranged inspaced apart relation to each other upon the flat upper surface 41 ofthe body or casing member 45. The attachment elements 53 can be castintegral with or welded to the body or casing member 45. There is anattachment element 53 adjacent each end of the body or casing member 45,at about the transverse center of said body or casing member, and saidattachment elements 63 are interconnected by a web 54. Each attachmentelement 63 includes an aperture by means of which it can be secured tothe entity, vehicle or snowplow which is to be supported.

The body or casing member 45 can be composed of any metal suitable tothe purpose for which the body or casing member 28 is employed, and theinsert piece 46 can be compdsed of any metal suitable to the purpose forwhich the insert pieceszi, 2i are employed.

Obviously, the shoe or runner of Figs. 12 to 19 includes theadvantageous features as set forth in connection with the shoe or runnerof Figs. 1 to 1.1. The body or casing member 45 is adapted to providewhat is in elfect a tough core of the shoe or runner of Figs. 12 to 19,and the insert dragged, the body or casing member is asseinbled with theinsert piece 46 and its material to protect said insert piece in thestructure against liability of becoming broken or otherwise impaired,and the hard, wear-resisting insert piece 45 isincorporated or inlaidwithin the body or casing member 45 in such manner that wear upon theshoe or runner will be considerably less rapid than would be the case iprising a body member of metal having a con-.-

cavity in a surface thereof, an insert piece of metal united with saidbody member and disposed within said concavity, and an insert piece ofmetal retained within said concavity by the first mentioned insertpiece.

2. An article of the character described, comprising a body member ofmetal having a concavity in a surface thereof, and insert pieces ofmetal retained in said concavity in contiguous relation to said surface,said insert pieces including a middle insert piece and a pair of insertpieces at the opposite sides of the middle insert piece, said middleinsert piece being united with said body member, as by Welding, and saidpair of insert pieces being retained within said concavity by saidmiddle insert piece.

3. An article of the character described, comprising a body member ofmetal having a concavity in a surface thereof, an insert piece of metalunited with said body member and die posed within said concavity toterminate flush with the base of said body member, and a second insertpiece of metal retained within said concavity by the first mentionedinsert piece to terminate flush with said base of the body memher.

4. An article for supporting an entity upon a surface for draggingmovement thereover, comprising a body member composed of metalpossessing physical properties, including toughness, adapted to rendersaid body member yieldable to force Without breaking, said body memberhaving a concavity in the base thereof, insert pieces of metalpossessing physical properties, in-

' eluding hardness, adapted to render said insert pieces efiectivelyresistant to abrasive action, said insert pieces being inlaid into theconcavity of said body member to terminate flush with the base of thebody member, and means within said concavity and between said insertpieces for retaining the insert pieces in fixed relation to said bodymember, said means and said insert pieces together filling saidconcavity.

5. An article of the character described, comprising a body member ofmetal having a concavity in a surface thereof, a piece of metal unitedwith said body member, and an insert piece of metal retained within saidconcavity by said firstmentioned piece of metal.

6. An article of the character described, comprising a body member ofmetal having a concavity in a surface thereof, a piece of metal unitedwith said body member, and an insert piece of metal retained within saidconcavity, said first mentioned piece of metal cooperating in theretention of said insert piece of metal in said body member.

7. An article for supporting an entity upon a surface for draggingmovement thereover, comprising a body member composed of metalpossessing physical properties, including toughness, adapted to rendersaid body member yieldable to force without breaking, said body memberhaving a concavity in the base thereof, insert pieces of metalpossessing physical properties, including hardness, adapted to rendersaid insert pieces effectively resistant to abrasive action, said insertpieces being inlaid into the concavity of said body member to terminateflush with the base of the body member, and means between said insertpieces cooperating with said body member to retain the insert pieces infixed relation to said body member.

HARRY L. CAMPBELL.

